Baseline sediment oxygen demand measurement at selected sampling stations in Pasig river using bench scale benthic respirometer chamber

The Sediment Oxygen Demand (SOD) describes the rate of oxygen consumption exerted by the bottom sediments on the overlying water. Studies in other countries show that SOD can account for more than 50 percent of the total oxygen demand in bodies of water. In the Philippines, studies using standard wa...

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Main Authors: Acacio, Laverne A., Medina, Mark Dave, Sevilleno, April Joy L.
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Language:English
Published: Animo Repository 2008
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Online Access:https://animorepository.dlsu.edu.ph/etd_bachelors/10496
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Institution: De La Salle University
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spelling oai:animorepository.dlsu.edu.ph:etd_bachelors-111412021-11-26T03:07:00Z Baseline sediment oxygen demand measurement at selected sampling stations in Pasig river using bench scale benthic respirometer chamber Acacio, Laverne A. Medina, Mark Dave Sevilleno, April Joy L. The Sediment Oxygen Demand (SOD) describes the rate of oxygen consumption exerted by the bottom sediments on the overlying water. Studies in other countries show that SOD can account for more than 50 percent of the total oxygen demand in bodies of water. In the Philippines, studies using standard water quality parameters (pH, temperature, and Total Suspended Solids) as stipulated in the Department of Environment and Natural Resources Administrative Order 34 (DAO 34 Series of 1990) are being used to describe used to describe the Water Quantity Criteria of Water bodies. However, none has been investigated on the effect of SOD. This study focused on the effect of the river sediments on the dissolved oxygen budget on the overlying waters of Pasig River, one of the major rivers in the Philippines. The sampling stations selected for this study were Marikina (upstream), Sanchez (middle stream) and Jones (downstream) stations. The dissolved oxygen (DO) uptake rates were measured by collecting river water and sediment samples from selected three sites per station. Laboratory methods for SOD rate determination were employed in this study with the use of bench-scale benthic respirometers for monitoring the concentrations of dissolved oxygen in a known volume of water that is recirculated above a known area of sediment. Sediment bed depth (2.5 cm and 5.0 cm) and chamber flow rate were varied and correlated to SOD rate. Important water quality parameters were correlated to SOD rate such as total suspended solids (TSS) and salinity while other parameters such as pH and initial DO were monitored. Sediments were visually classified into sand or silt/clay and the effect of sediment type on SOD rate was determined. SOD rates generally increased for practically all sites in the three stations of Pasig River when flow rates increased. In Marikina Station, a 34% increase in SOD rates were determined when flow rates were varied 10.6 to 20.22 ml/s, while the increase is SOD rates from a flow rate of 10.6 to 32.75 ml/s was about 260%. In Sanchez Station, there was a low decrease in SOD rates of 14% from a flow rate of 10.6 to 20.22 ml/s while increase of 180% from flow rate of 10.6 to 32.75 ml/s was determined. In Jones Station, the increase in SOD rate when the flow rate was varied from 10.6 to 20.22 ml/s was 8% while a 44% increase was determined when the flow rate was increased from 10.6 to 32.75 ml/s. No consistently significant correlation was found between SOD rates and salinity between sites and stations of Pasig River. Initial DO concentration measured during sampling revealed extremely low DO levels not greater than 3.3 milligrams/liter (mg/L) and pH readings within the range of 6.5 to 8.5 at all sites in all stations. Visual inspection of sediments in the range of 6.5 to 8.5 at all sites in all stations. Visual inspections of sediments in the three stations revealed sandy sediments in Marikina Stations and silt/clay sediments in Sanchez and Jones Stations. SOD rates measured in Marikina Station, with sandy sediments, were lower (0.1280 1.4894 g/m2 / day) compared to the SOD rates measured in Sanchez (0.584 7.573 g/m2/day) and Jones (1.120 3.745 g/m2/day) Stations, with silt/clay sediments. 2008-01-01T08:00:00Z text https://animorepository.dlsu.edu.ph/etd_bachelors/10496 Bachelor's Theses English Animo Repository Water--Dissolved oxygen--Measurement--Philippines River sediments--Philippines Chemical Engineering
institution De La Salle University
building De La Salle University Library
continent Asia
country Philippines
Philippines
content_provider De La Salle University Library
collection DLSU Institutional Repository
language English
topic Water--Dissolved oxygen--Measurement--Philippines
River sediments--Philippines
Chemical Engineering
spellingShingle Water--Dissolved oxygen--Measurement--Philippines
River sediments--Philippines
Chemical Engineering
Acacio, Laverne A.
Medina, Mark Dave
Sevilleno, April Joy L.
Baseline sediment oxygen demand measurement at selected sampling stations in Pasig river using bench scale benthic respirometer chamber
description The Sediment Oxygen Demand (SOD) describes the rate of oxygen consumption exerted by the bottom sediments on the overlying water. Studies in other countries show that SOD can account for more than 50 percent of the total oxygen demand in bodies of water. In the Philippines, studies using standard water quality parameters (pH, temperature, and Total Suspended Solids) as stipulated in the Department of Environment and Natural Resources Administrative Order 34 (DAO 34 Series of 1990) are being used to describe used to describe the Water Quantity Criteria of Water bodies. However, none has been investigated on the effect of SOD. This study focused on the effect of the river sediments on the dissolved oxygen budget on the overlying waters of Pasig River, one of the major rivers in the Philippines. The sampling stations selected for this study were Marikina (upstream), Sanchez (middle stream) and Jones (downstream) stations. The dissolved oxygen (DO) uptake rates were measured by collecting river water and sediment samples from selected three sites per station. Laboratory methods for SOD rate determination were employed in this study with the use of bench-scale benthic respirometers for monitoring the concentrations of dissolved oxygen in a known volume of water that is recirculated above a known area of sediment. Sediment bed depth (2.5 cm and 5.0 cm) and chamber flow rate were varied and correlated to SOD rate. Important water quality parameters were correlated to SOD rate such as total suspended solids (TSS) and salinity while other parameters such as pH and initial DO were monitored. Sediments were visually classified into sand or silt/clay and the effect of sediment type on SOD rate was determined. SOD rates generally increased for practically all sites in the three stations of Pasig River when flow rates increased. In Marikina Station, a 34% increase in SOD rates were determined when flow rates were varied 10.6 to 20.22 ml/s, while the increase is SOD rates from a flow rate of 10.6 to 32.75 ml/s was about 260%. In Sanchez Station, there was a low decrease in SOD rates of 14% from a flow rate of 10.6 to 20.22 ml/s while increase of 180% from flow rate of 10.6 to 32.75 ml/s was determined. In Jones Station, the increase in SOD rate when the flow rate was varied from 10.6 to 20.22 ml/s was 8% while a 44% increase was determined when the flow rate was increased from 10.6 to 32.75 ml/s. No consistently significant correlation was found between SOD rates and salinity between sites and stations of Pasig River. Initial DO concentration measured during sampling revealed extremely low DO levels not greater than 3.3 milligrams/liter (mg/L) and pH readings within the range of 6.5 to 8.5 at all sites in all stations. Visual inspection of sediments in the range of 6.5 to 8.5 at all sites in all stations. Visual inspections of sediments in the three stations revealed sandy sediments in Marikina Stations and silt/clay sediments in Sanchez and Jones Stations. SOD rates measured in Marikina Station, with sandy sediments, were lower (0.1280 1.4894 g/m2 / day) compared to the SOD rates measured in Sanchez (0.584 7.573 g/m2/day) and Jones (1.120 3.745 g/m2/day) Stations, with silt/clay sediments.
format text
author Acacio, Laverne A.
Medina, Mark Dave
Sevilleno, April Joy L.
author_facet Acacio, Laverne A.
Medina, Mark Dave
Sevilleno, April Joy L.
author_sort Acacio, Laverne A.
title Baseline sediment oxygen demand measurement at selected sampling stations in Pasig river using bench scale benthic respirometer chamber
title_short Baseline sediment oxygen demand measurement at selected sampling stations in Pasig river using bench scale benthic respirometer chamber
title_full Baseline sediment oxygen demand measurement at selected sampling stations in Pasig river using bench scale benthic respirometer chamber
title_fullStr Baseline sediment oxygen demand measurement at selected sampling stations in Pasig river using bench scale benthic respirometer chamber
title_full_unstemmed Baseline sediment oxygen demand measurement at selected sampling stations in Pasig river using bench scale benthic respirometer chamber
title_sort baseline sediment oxygen demand measurement at selected sampling stations in pasig river using bench scale benthic respirometer chamber
publisher Animo Repository
publishDate 2008
url https://animorepository.dlsu.edu.ph/etd_bachelors/10496
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